From 5c459618453c684cd7bcd8c2b8117bb3e6ad1b27 Mon Sep 17 00:00:00 2001
From: Albert Cheng <acheng@hdfgroup.org>
Date: Fri, 22 Mar 2013 17:05:57 -0500
Subject: [svn-r23434] Improvement: DFFV-8245 Use Clang as the compiler for the
 Mac platform.

Changed all Mac to use clang/clang++ as the default C and CXX compilers if
not provided by the user. Still use gfortran as the default fortran
compiler since Apple does not provide any fortran compiler.

Tested: passed all three macs OS, snow leapord (fred), lion (duck) and
mountain lion (wren). Also passed test using Apple gcc, Gnu gcc, Intel
as the C compilers and all corresponding CXX compilers fits in.
Did not run h5committest or other non-mac platform since this change
affect Apple platforms only.
---
 config/apple | 39 +++++++++++++++++++++++++++++++++++----
 1 file changed, 35 insertions(+), 4 deletions(-)

diff --git a/config/apple b/config/apple
index c5c0a19..d2d4663 100644
--- a/config/apple
+++ b/config/apple
@@ -20,17 +20,16 @@
 #
 # See BlankForm in this directory for details.
 
-# The default compiler is `gcc'
+# The default compiler is `clang'
 if test "X-" = "X-$CC"; then
-    CC=gcc
-    CC_BASENAME=gcc
+    CC=clang
+    CC_BASENAME=clang
 fi
 
 # Figure out compiler flags
 . $srcdir/config/gnu-flags
 # temp patch: if GCC 4.2.1 is used in Lion or Mountain Lion systems, do not
 # use -O option as it causes failures in test/dt_arith.
-#echo host_os=$host_os
 case "$host_os" in
     darwin1[12].*)   # lion & mountain lion
 	#echo cc_vendor=$cc_vendor'-'cc_version=$cc_version
@@ -48,6 +47,11 @@ esac
 . $srcdir/config/intel-flags
 if test "X-" = "X-$FC"; then
     case $CC_BASENAME in
+        clang)
+	    # clang has no fortran compiler. Use gfortran.
+            FC=gfortran
+            FC_BASENAME=gfortran
+            ;;
         gcc*)
             FC=gfortran
             FC_BASENAME=gfortran
@@ -59,8 +63,30 @@ if test "X-" = "X-$FC"; then
     esac
 fi
 
+if test "X-" = "X-$CXX"; then
+    case $CC_BASENAME in
+        clang)
+            CXX=clang++
+            CXX_BASENAME=clang++
+            ;;
+        gcc)
+            CXX=g++
+            CXX_BASENAME=g++
+            ;;
+        icc)
+            CXX=icpc
+            CXX_BASENAME=icpc
+            ;;
+    esac
+fi
+
 # compiler version strings
 case $CC in
+    clang)
+        cc_version_info=`$CC $CFLAGS $H5_CFLAGS --version 2>&1 |\
+            grep 'Apple' | sed 's/(.*//'`
+        ;;
+
     *gcc*)
         cc_version_info=`$CC $CFLAGS $H5_CFLAGS --version 2>&1 | grep -v 'PathScale' |\
             grep 'GCC' | sed 's/.*\((GCC) [-a-z0-9\. ]*.*\)/\1/'`
@@ -97,6 +123,11 @@ esac
 
 # get c++ version info
 case $CXX in
+    clang++)
+        cxx_version_info=`$CXX $CXXFLAGS $H5_CXXFLAGS --version 2>&1 |\
+            grep 'Apple' | sed 's/(.*//'`
+        ;;
+
     *g++*)
         cxx_version_info=`$CXX $CXXFLAGS $H5_CXXFLAGS --version 2>&1 |\
             grep 'GCC' | sed 's/.*\((GCC) [-a-z0-9\. ]*.*\)/\1/'`
-- 
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